Men who go untreated have a 5.5 times higher risk of developing nongonococcal urethritis, or inflammation of the urethra. Women, on the other hand, are 1.7 to 2.5 times more likely to wind up with pelvic inflammatory disease, which can lead to early birth and infertility. BASHH estimates this means as many as 4,800 women in the United Kingdom could become infertile annually as a result of MG.

The majority of people don’t show symptoms of MG, but those who do can easily confuse them for other STIs—particularly chlamydia, which has similar signs, like painful urination and bleeding after sex.

To make matters worse, if you do contract it, there’s a good chance you won’t realize it. The majority of people don’t show symptoms, but those who do can easily confuse them for other STIs—particularly chlamydia, which has similar signs, like painful urination and bleeding after sex. Those similarities are one of the reasons MG is on the path toward becoming a superbug. According to UK-based doctor Mark Lawton, that’s because medical experts who mistakenly treat MG patients for chlamydia are only making the under-diagnosed condition more resistant to antibiotics.

Because of the frequent misdiagnoses, BASHH has released new treatment guidelines that aim to derail MG’s journey to superbug status. “It’s already increasingly resistant to most of the antibiotics we use to treat chlamydia and changes its pattern of resistance during treatment, so it’s like trying to hit a moving target,” says Peter Greenhouse, a UK-based doctor.

It’s not clear yet how many people in the United States are affected by MG, but don’t take your chances. This potential superbug is serious business, and when it comes to protecting your body and your reproductive system, don’t mess around.